29.2 Overview

The Analog Comparator (AC) compares the voltage levels on two inputs and gives a digital output based on this comparison. The AC can be configured to generate interrupt requests and/or events upon several different combinations of input change.

The dynamic behavior of the AC can be adjusted by a hysteresis feature. The hysteresis can be customized to optimize the operation for each application.

The input selection includes analog port pins, DAC output, and internal references. The analog comparator output state can also be output on a pin for use by external devices.

The AC has one positive input and one negative input. The positive input source is one of a selection of three analog input pins. The negative input is chosen either from analog input pins or from internal inputs, such as an internal voltage reference.

The digital output from the comparator is '1' when the difference between the positive and the negative input voltage is positive and '0' otherwise.

This device provides three instances of the AC controller, AC0, AC1, and AC2.